Fallen in Chinese / Japanese...

堕天使 is the Japanese title for a fallen angel.

This can also refer to a demon or Satan.

飛虎隊 is the full Chinese title of the “Flying Tigers Group.”

These were the American pilots that volunteered to go to China and fight the Japanese before the entry of the USA into World War Two. These fighter pilots were so esteemed in China that fallen American pilots could always find refuge in villages and safe passage and escape to areas of China that were not occupied by Japan at that time. Chinese villagers helped such fallen pilots with full knowledge that when the Japanese occupation forces found out, all the men, women, and children in the village would be massacred by Japanese troops (there are more than a few known cases of such massacres).

The Flying Tigers successfully kept supply lines to the Chinese resistance open and divided Japanese forces at a crucial time while America prepared to join WWII officially.

A wall scroll like this honors the men who risked or gave their lives as noble volunteers and is a reminder of the best moment in the history of Sino-American relations.

These three characters literally mean “flying tiger(s) group/team/squad.”

Note: Hanging these characters on your wall will not make you any friends with Japanese people who are aware or this history (most Japanese have no idea, as Japan’s involvement in WWII has all but been erased from school textbooks in Japan).

前赴後繼 is a Chinese proverb that figuratively means “to advance dauntlessly in wave upon wave.”

It suggests that you should or can carry on and have the strength to keep going.

While this proverb is a little bit militaristic, it suggests that despite a fallen comrade (or perhaps a loved one), you should keep going and work towards the goal they intended.

吃一塹長一智 is a Chinese proverb that means “Fall into a moat, and you will gain wisdom from the experience.”

It really suggests that the failures, troubles, frustrations, and setbacks that you encounter in your life are actually helping you to find wisdom. Some would also translate this proverb as “Learn from your mistakes” or “Learn from your experience.”

If you are studying Chinese, you will recognize the first character as “eat,” but in this case, it means to “experience” (as used in this proverb, it is suggesting that you have fallen into a moat and/or had a hard time crossing it).
Translated character by character, this whole proverb is, “Experience one moat, gain one wisdom/knowledge.”

Note: This can be pronounced in Korean, but it's not a commonly used phrase.

墮落天使 means “fallen angel” in Chinese.

墮落天使 is also the title of a 1995 movie that was popular in Hong Kong.

墮落 means to degrade, degenerate, become depraved, corrupt, fall from grace, or descend.

天使 means angel (more literally “heavenly messenger” or “divine messenger”).